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Title: Two-phase modeling of mushy zone parameters associated with hot tearing

Abstract

A two-phase continuum model for an isotropic mushy zone is presented. The model is based upon the general volume-averaged conservation equations, and quantities associated with hot tearing are included, i.e., after-feeding of the liquid melt due to solidification shrinkage is taken into account as well as thermally induced deformation of the solid phase. The model is implemented numerically for a one-dimensional model problem with some similarities to the aluminum direct chill (DC) casting process. The variation of some key parameters that are known to influence the hot-tearing tendency is then studied. The results indicate that both liquid pressure drop due to feeding difficulties and tensile stress caused by thermal contraction of the solid phase are necessary for the formation of hot tears. Based upon results from the one-dimensional model, it is furthermore concluded that none of the hot-tearing criteria suggested in the literature are able to predict the variation in hot-tearing susceptibility resulting from a variation in all of the following parameters: solidification interval, cooling contraction of the solid phase, casting speed, and liquid fraction at coherency.

Authors:
;
Publication Date:
Research Org.:
SINTEF Materials Technology, Oslo (NO)
OSTI Identifier:
20075688
Alternate Identifier(s):
OSTI ID: 20075688
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
Additional Journal Information:
Journal Volume: 31; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 1073-5623
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MICROSTRUCTURE; FRACTURE PROPERTIES; CASTING; METALS; MATHEMATICAL MODELS; LIQUID METALS; SOLIDIFICATION; SHRINKAGE; DEFORMATION; CRACKS

Citation Formats

Farup, I., and Mo, A. Two-phase modeling of mushy zone parameters associated with hot tearing. United States: N. p., 2000. Web. doi:10.1007/s11661-000-0264-2.
Farup, I., & Mo, A. Two-phase modeling of mushy zone parameters associated with hot tearing. United States. doi:10.1007/s11661-000-0264-2.
Farup, I., and Mo, A. Mon . "Two-phase modeling of mushy zone parameters associated with hot tearing". United States. doi:10.1007/s11661-000-0264-2.
@article{osti_20075688,
title = {Two-phase modeling of mushy zone parameters associated with hot tearing},
author = {Farup, I. and Mo, A.},
abstractNote = {A two-phase continuum model for an isotropic mushy zone is presented. The model is based upon the general volume-averaged conservation equations, and quantities associated with hot tearing are included, i.e., after-feeding of the liquid melt due to solidification shrinkage is taken into account as well as thermally induced deformation of the solid phase. The model is implemented numerically for a one-dimensional model problem with some similarities to the aluminum direct chill (DC) casting process. The variation of some key parameters that are known to influence the hot-tearing tendency is then studied. The results indicate that both liquid pressure drop due to feeding difficulties and tensile stress caused by thermal contraction of the solid phase are necessary for the formation of hot tears. Based upon results from the one-dimensional model, it is furthermore concluded that none of the hot-tearing criteria suggested in the literature are able to predict the variation in hot-tearing susceptibility resulting from a variation in all of the following parameters: solidification interval, cooling contraction of the solid phase, casting speed, and liquid fraction at coherency.},
doi = {10.1007/s11661-000-0264-2},
journal = {Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science},
issn = {1073-5623},
number = 5,
volume = 31,
place = {United States},
year = {2000},
month = {5}
}